Engine governor



June 21, 1949.

M. MALLORY ENGINE GOVERNOR Filed Jan. 10, 1944 I I St m w a w W 2 mm .m W 0 M Y B V M E 7 I am. w m r IF, 1:: Z w a m ,/o m H: 3 I l: w i A W a i F u: u g W 6 v T EL v c a 0 IIIILPITI v .A/w

Patented June 21, 1949 UNITED STATES PATEN ENGINE GOVERNOR I Marion Mallory, Detroit, Mich. Application January 10, 1944, Serial No. 517,623

3 Claims.

This invention relates to an engine governor. In my copending application Serial No. 473,062, filed, January 21, 1943, now Patent No. 2,368,995, I have shown a governor for an internal combustion engine wherein the governor valve is controlled by asuction device operated by intake manifold suction. proved exceptionally satisfactory in service, and

1 in particular controls the speed of the engineunder varying load conditions with substantially no surging. However, in some cases it is desirable to retard or somewhat delay the opening of the governor valve.

This invention contemplates an improvement upon my prior governor in that the opening of l the governor valve is controlled or smoothed out, that is, the governor valve is controlled so that This engine governor has ever, th'is'too abrupt opening of governor valve- 30 will tend to swing governor valve 6 wide open which, -in some cases. might cause the engine to somewhat overrun its governed speed before the overnor 6 is moved back or settles back to bring the engine down to its governed speed. 'How-.

6 is prevented by the dash pot arrangement in that as the spring 30, pulls the governor valve open, valve 6 contacts the end of rod 25 and the dash pot action on piston 24 in cylinder 23 prevents too rapid opening of the governor valve since the air entrapped in the cylinder 23 between the piston 24 and the orifice2l escapes it will open'more smoothly in response to'manifold suction;

In the drawing: Fig. l is a vertical section showing my improved engine-governor.

Fig. 2 is a fragmentary sectional view howing a modification thereof.

My engine governor arrangement comprises the following parts: carburetor housing [with an air inlet'2, throttle valve 3, governor housing-- 4 with a fuel mixture outlet 5, governor valve 6.

carried on'pintle l and connected by crank a m 8 androd 9 with diaphragm l0 of suction device H. Suction device II is connected byconduits l2 and [3 with the intake passageway l4 on the engine side of governor valve 6 and with conduit IS on the atmosphere side of governor valve 6. Adjustable restriction It is positioned between conduits l2" and I3.- Suction device II is arranged to be air bled to atmosphere through conduit l1, passageway 18 in'the distributor. shaft, orifices 19 and 20. Orifice I9 is controlled by a centrifugally unbalanced valve '2] which is urged toward open position by tension spring 22.

The invention as thus far described is identical with that shown in my copending application Serial No. 473,062 and operates as described therein. 7

For controlling opening of governor valve 6 there is provided a dash pot mechanism comprising cylinder 23, piston 24, piston rod 25, opening 26 between cylinder 23 and the intake passageway l4 and outlet to atmosphere 21 for cylinder 23 and compression spring 28 between piston 24 and the end of cylinder 23.

The operation of the device is as follows: Y Assuming that the engine is idling with no-load and the throttle valve 3 is opened wide, tension spring slowly as the governor valve 6 moves the piston toward the orifice 21 and this characteristic dash pot action retards or controls the opening of governor valve 6. g I

As soon asv the engine slightly exceeds its governed speed-and suction device it starts to close governor valve 6, the vacuum will build up inthe' intake passageway on the engine side of governor valve. 6 and this vacuum acts through passageway 26 upon piston 24 tending to draw the same inwardly, thereby acting-through rod25 which f nowjabuts' valve G-to assist in the closing of the governor valve.

inthe principal form of the invention, is preferred but'can be omitted if desired. The operation of the device is 'as'followsz Housing l'l of thesuction device is open to at.-

mosphere on theleft hand side, of diaphragm l0 through orifice 33 butthe portion of housing H v 'on the right hand side of diaphragm l0 communi- 1 cates only with conduit i2. It will be seen that diaphragm l0 co-acts with ball check 3| to give 'a dash pot action. Whenever, in the operation of the governor valve 6, tension spring tends to swing governor valve 8. open too rapidly, rod

9 draws diaphragm l0 toward the left; thereby tending to increase the effective size of chamber 34 on-the right hand side of diaphragm 'IO. and

creates a sub-atmospheric pressure inthis chamber, thereby drawing check valve 3| down against orifice 32 to retard the opening movement of valve =6 and cause the same to open more smooth- 1 ly and slowly, On the other hand, when the engine slightly exceeds its governed speed and r orFic'E- the intake passageway vacuum rises, this vacuum will lift valve ii oi! oi its seat so that the vacuum will be impressed upon diaphragm l and swing the governor valve 8 toward closed position.

In the structure shown in Fig. 1, spring 28 is preferred but can be omitted if desired because the vacuum in the manifold, when valve 6 is partially or fully closed, acts through opening '26 on piston 24 to draw piston 24 toward the right and as valve 8 opens it moves piston 24 to the left as it functions with cylinder 23 as a dash pot as described above. In the structure shown in Fig. 1 when throttle valve 3 is closed for idle then the intake passageway suction will act upon piston 24 moving the same toward the right and thereby tending to close governor valve 6.

I claim:

l. A device for controlling the speed of an internal combustion engine having an intake passageway comprising a governor valve in said passageway, means actuated by changes of pressure in the intake passageway on the engine side of said governor valve and having an operative connecgovernor valve toward closed position, a throttle valve on the atmosphere side of said governor valve, resilient means tending to open said governor valve, said resilient means moving said governor valve toward open position when the air bleed to said pressure actuated device is opened, a dash pot for controlling the rate of opening of said governor valve, and a servo motor responsive to the intake passageway suction when the throttle valve is at idle and thereby tending to close said governor valve.

2. A device for controlling the speed of an internal combustion engine having an intake passageway comprising a governor valve in said passageway, means actuated by changes of pressure in the intake passageway on the engine side of said governor valve and having an operative connection with said governor valve for controlling the flow of motive fluid through said intake passageway, speed controlled air bleed means for bleeding air into said pressure actuated means below the governed speed of the engine and tending to close as the engine reaches its governed speed whereby the pressure actuated means tends to move said governor valve toward closed position, a throttle orifice to atmosphere whereby the piston and cylinder serve as a dash pot controlling the rate 01' opening of said governor valve, the cylinder on the other side of said cylinder being in communication with said intake passageway whereby when the governor valve moves toward closed position the intake passageway suction moves said piston inwardly toward the intake passageway, and means for operatively connecting the piston to said governor valve to control the rate of opening of said governor valve.

3. A device for controlling the speed of an internal combustion engine having an intake passageway comprising a governor valve in said intake passageway, means actuated by changes of pressure in said intake passageway on the engine side ofsaid governor valve and having an operative connection with said governor valve whereby the governor valve is actuated to control the flow of motive'fluid through said passageway, an air bleed orifice for said pressure actuated means, a centrifugally unbalanced valve rotated in accordance with the speed of the engine for controlling said orifice, said valve tending to close said air bleed move said governor valve toward closed position.

valve on the atmosphere side of saidgovernor.

cylinder on one side of] said piston having an resilient means for opening said throttle valve when the speed of the engine falls below its governed speed, and a dash pot independent of said pressure actuated means and operatively associated with said governor valve for controlling the rate of opening. of said governor valve, a manually operated throttle valve on the atmosphere side of the governor valve, the said dash pot comprisinga cylinder and piston, the cylinder on one side of the piston having an orifice to atmosphere whereby the. piston and that portion of the cylinder serves-as a dash pot and the portion of the cylinder on the other side of the piston has a communication with the intake passageway on the engine side of the governor valve whereby the piston is moved toward the intake passageway in response to manifold suction thereby tending to close the governor valve when the manually operated throttle valve is at idle.

MARION MALLORY.

REFERENCES CITED The following references are of record in the file of this patent:

- UNITED STATES PATENTS 

